The word for music in Japanese is 音楽 (ongaku), combining the kanji 音 ("on"sound) with the kanji 楽 ("gaku" fun, comfort)
The music of Japan includes a wide array of performers in distinct styles both traditional and modern Japan is the second largest music market in the world, behind the United States and most of the market is dominated by Japanese artists.

Local music often appears at karaoke venues, which is on lease from the record labels. Traditional Japanese music is quite different from Western Music and is based on the intervals of human breathing rather than mathematical timing.

You need to choose a Japanese song, rehearse and record it. You can record it with or without music. It must not be too short so find a song of a decent length.

Japanese Songs
Japanese Songs 2

http://www.japanesejoy.com/easy-songs/